Abstract
One of the requirements for ships equipped with dynamic positioning system is the ability to maintain a given position in various hydrometeorological conditions. At the same time, efforts at reducing electricity consumption are made in order to reduce operating costs and emissions of exhaust gases, such as sulfur oxides and greenhouse gases such as carbon dioxide (CO2). For this purpose, the ship designer at the design stage must predict both how much energy the ship will theoretically use during operation and how the expenditure can be reduced. The publication presents a comparison of energy consumption with two different approaches to ship positioning: the use of classic dynamic positioning utilizing a set of thrusters and by using a set of anchors. In order to determine the energy consumption during positioning, the matrix method was used, on the basis of which the analysis of the ability to hold the position of the ship (capability plot) was performed, in accordance with the recommendations of the classification society DNV GL. Thanks to this analysis, it was possible to find such a distribution of thrust vectors on propulsors that the ship would not lose its set position under the hydrometeorological conditions specified in the analysis. As a result of comparing the two positioning systems, it turned out that using anchor-based positioning uses 24% less energy than positioning based on a set of thrusters, which translates into 24% less CO2 emissions into the atmosphere.
Highlights
Manuel Riquelme-SantosThe history of dynamic positioning systems dates back to 1954, when the OffshoreCompany in Mexico launched the first oil rig [1]
New methods of controlling the dynamic positioning systems and many publications began to emerge in the world, which until today are considered as the basis for engineers designing such systems [4,5,6]
Other requirements that must be met by a vessel with a dynamic positioning system is to have up-to-date graphs of the ability to maintain position, the so-called capability plots (CP) [25]
Summary
The history of dynamic positioning systems dates back to 1954, when the Offshore. Company in Mexico launched the first oil rig [1]. Regardless of the configuration of the propulsion system and the type of thrusters, the owners of all ships equipped with a dynamic positioning system are required to carry out periodic tests related to the system’s resistance to possible damage, called FMEA (Failure Mode and Effect Analysis) [19,20,21] Such analysis is performed by companies licensed by the International Maritime Organization (IMO) [22,23,24]. Other requirements that must be met by a vessel with a dynamic positioning system is to have up-to-date graphs of the ability to maintain position, the so-called capability plots (CP) [25] They are performed so that in the event of a DP system failure, it is possible on their their basis to decide the ship’s course in order to minimize the influence of wind. VI of the MARPOL Convention [30]
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